| 摘要 |
<p>781,325. Quantizing circuits. BRITISH BROADCASTING CORPORATION. Feb. 15, 1956 [March 11, 1955], No. 7273/55. Class 40 (4). A quantizing circuit comprises an input circuit connected via a gate to an output circuit means for maintaining the output signal constant when the gate is closed and means for opening the gate when the difference between the input and output signal exceeds a predetermined amount. As shown, the output signal on terminal 13 is determined by the charge on condenser 15 and is compared with the input signal on terminal 11 by means of the " long-tailed pair " 22, 23. When the two signals differ by a predetermined amount (determined by the tapping on resistor 26) the anode potential of one of the valves 22, 23 is raised sufficiently to cause one of the diodes 24 to conduct and pulse the mono-stable flip-flop 27, 28. The output from the latter feeds a phase-splitter 29 whose outputs cause the rectifier gate 19 to open thereby connecting the input terminals 11 to the output terminal 13 and allowing the charge on condenser 15 to take up a new value for subsequent comparison.</p> |
